FWIW, the commercial M-S rifles & carbines don't need any wood removed for the side scope mount base because the factory made them with a removeable filler plate attached to the LH side of the action, that's to meant to be removed & replaced by the proper base.
D'oh! (a homeresque cry of despair)!
You mean, I could have picked up one of the side mount bases for a fraction of the cost of the EGW setup? And still have been able to use the iron sights?
I think I shall attempt to locate one of those mounts on Ebay, and try to sell the others now!